162页  豪斯曼检验  出现如下问题：

. hausman FE RE, constant sigmamore
hausman cannot be used with vce(robust), vce(cluster cvar), or p-weighted data
r(198);

怎么办？

163页

. quietly xtreg fatal beertax spircons unrate perinck,re

. scalar theta=e(theta)

. global yandxforhausman fatal beertax spircons unrate perinck

. sort state

. foreach x of varlist $yandxforhausman{
  2. by state:egen mean `x'=mean(`x')
  3. gen md`x'=`x'-mean`x'
  4. gen red`x'=`x'-theta*mean`x'
  5. }
fatal already defined
r(110);

. quietly xtreg redfatal redbeertax redspircons redunrate redperinck mdbeertax mdspircons mdunrate mdperinck,vce (cluster state)
variable redfatal not found
r(111);

. test mdbeertax mdspircons mdunrate mdperinck
mdbeertax not found
r(111);

谁能告诉我怎么解决？

173页

. quietly xtgls lnc lnp lnpmin lny state2-state10 t,igls panel(het)

. estimates store hetero

. quietly xtgls lnc lnp lnpmin lny state2-state10 t,igls

. estimates store homo

. local df=e(N_G) - 1

. lrtest hetero homo, df(`df')
'.' found where number expected
r(7);


. quietly xtgls lnc lnp lnpmin lny state2-state10 t,panels(cor) cor(ar1)

. xttest3
unrecognized command:  xttest3
r(199);

182页

. xtabond lwage occ south smsa ind,lags(2) maxldep(3) pre(wks, lag(1,2)) endogenous(ms,lag(0,2)) endogenous(union,lag(0,2)) twostep vce(robust)
endogenous(union,lag(0,2)) invalid
r(198);


明白了   （输入错误）

. lrtest hetero homo, df(`df')
'.' found where number expected
r(7);

这个问题怎么解决吗？